Recorder Paul Isaacs said: “What is really worrying to me and to those who have sent reports to me about you is that you seem to have no understanding of how your behaviour effects other people and no understanding of how it is that you are responsible for your behaviour.”

Leeds Crown Court heard Pattison and two other unknown men targeted two victims as they walked from the Red Lion pub in Seacroft back to their hotel nearby.

One victim was left with a cut to the head, bruising to his ribs and arms and a puncture wound to his hand. The other victim was repeatedly punched to the head.

Pattison was arrested hours after the attack, in the early hours of October 24 last year.

Blood from one of the victims was found on his tracksuit and trainers.

In a second incident, on April 11 this year, Pattison argued with a man in the street in Cross Gates before lunging at him with an eight-inch lock knife.

He then went to the home of his ex-girlfriend in Halton Moor but was made to leave.

Pattison then removed his shirt and began chasing people around the street outside.

Gillian Batts, mitigating, described her client as “a troubled young man.”